Time-switch.



T. 1. MURPHY.

TIME SWITCH.

APPLICATION man AuG.5'.19|4.

Patented-Sept. 7, 1915.

fill/11111111111 ENT THOMAS J. MURPHY, OF ROCHESTER, NEW YORK.

TIME-SWITCH.

To all whom t may concern Be it known that I, THOMAS J. MURPHY, asubject of the King of Great Britain, and a resident of Rochester, inthe county of Monroe and State of New York, have invented a certain newand useful Time-Switch; and l do hereby declare the following to be afull, clear, and exact description of the invention,`V such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to thecharacters of reference marked thereon, which form a part of thisspecification..

y invention relates to time switches, and it particularly is applicableto an electric motor startenfor anv automobile engine.

It has for-is object to provide a switch which may be closed for a shortinterval of time and at the expiration of the interval will beautomatically opened by the continuation of the closing movement'orpressure of the switch.

The invention may be contained in many forms of constructions usable fordifferent purposes all of which come within the pur view of my claimshereafter appended. To Show the practicability of my invention l haveselected one of such constructions as an example and shall describe ithereinafter.

he construction selected is illustrated in the accompanying drawings.

Figure l illustrates a vertical sectional view of the particular switchselected. Fig.

2 is a view of a contact plate shown also in' Fig. 1. Fi 3 is atransverse Section Showing the bu erpiston for regulating the in-`terval in which the piston is closed.

l, Fig. l, is'an actuating member which may be of any form. As shown inthe illustration it is a short rod having in its end sockets 2 and 3. ltmay extend 'through a door l of an automobile and be actuated by a pedal5 having the hub or spindle G which is secured in the socket 2 in theupper end of the rod l by means ofthe pin 7. The switch may be operatedby the operator pressing his foot upon the pedal 5..

The lower end of the rod l is secured to a housing l0 movable in a shell1l, by means of a pin l2. The upper end of a rod 13 is slida'bly movablein the housing 10 and the eocket 3 located in the lower end of the rodSpecification of Letters Patent.

Patented Sept. 7, 1915.

Application mea august 5, 1914. serial No. 855,341.

1. A disk 14 is secured by the rod 13 by means of a pin 15. A spring 16is located intermediate the upper end of the housing and the disk 14.rl"he spring 16 tends to keep the disk 14 at the lower end of thehousing and elastically holds the rod 13 down to the farthermost point,depending upon the location of the 13 is connected to a detent fortemporarily holding it. so that the contacts will be held closed for ashort time. The detent is in the form of a buer having a piston 20.

A valve disk 21 is supported on movable pins 22 below the piston 20 andis adapted to seat on the circular ridge 23 located on the bottom of thepiston 20.. The piston 20 1s also provided with openings 241 which areclosed by thel disk 21. This forms a clap valve which resists thedownward movement of the piston 20, but allows a free upward movement ofthe piston. rlhe piston 2O is located in a cylinder 30 forming a part ofthe lower end of the shell 11. lThe piston moves in a contracted portion31 of the cylinder 30 and detains the piston 20. The part 3 2 of thecylinder below the contracted portion is enlarged so as to permitthebuffer material such as air,

oil, or glycerin, to pass freely around the periphery of the piston whenthe piston is moved into said lower part 32. The two parts of the shell11 are secured together by the bolts 55.

A contact plate 410 is supported by means of pins Lil below the lowerend of the housing l0., so as to permit vertical movements of thecontact ei0 relative ,to the housingJ lG. rlhe plate and the pins 41-1are elastically held away from the lower end or" the housing 1G by thesprings d2. A coacting Contact plate is secured to the rod 13 by meansof the hubbed disk t, and the pin 45. contacts l0 and d3 are suitablyinsulated from the other parte othe'switch. Each contact is connectedthrough the insulated wires i6 and binding ternal circuit .an invertedthinible is located on and depends from the top of the cylinder 30, andis shouldered the upper end of the cylinder. A. spring 51 hai/*inglighter resisting pressure than the spring i6 is located between thelower end of the thimble 50 and the Llei. rlihe spring 5l presses uponthe disk 14 on the rod 13. The rod.

posts 4J? with by the pedal 5 the contacts 40 and 43 imme' diatelyclose, the rod 13 being held up by the piston as the valve disk 21 isimmediately closed. The spring 16 is compressed and tends to drive therod 13 and the iston 20 downward. The valve disk 21 eing closed thefluid seeps by the piston 20 very.

slowly and consequently allows the piston 2O to descend very slowly.Meantime the external circuit 48 through the binding post 47 is closed.When the .piston 20 reaches the enlarged portion 32 where the Huid willfreely pass around the periphery of the piston, the spring 16 will snapor throw the piston 20 to the bottom of thecylinder consequentlyseparating the contacts 40 and 43, thereby breaking the external circuitby the operaf be heldfaway from the contact 40 notwith standing the factthat the pedal 5 may be" held down by the foot of the operator, the`movement of the pedal being limited by the 'pin 41.2. When the pedal is`released the spring rod 13 and the piston 20. The valve disk 21 therebybeing removed from its seat 23,

51 operates to lift the housing 10, the

l the piston 20 and the other parts freely move upward. The piston 20again enters the contracted portion 31 of the cylinder 30 and when, thepedal 5' is again pressed downward between the contacts 40 and 43 andthe s ring 16 being compressed operates to s owly force the piston 20vdown the conupon rod 13 is released and the circuit is opened, When thespring 16 has been compressed by movement of the pedal 5 a shortdistance it will continue to move the piston 20 notwithstanding the factthat there is no further downward movementof the pedal by the foot.Under ,such conditions the spring 16. continues to operate the rod 13and piston 20 after the foot has moved the pedal but a short distancelby reason of the fact that the piston acting as a buffer delays theoperation of the spring 16 consequently, if time `is given for theoperation of the spring 16, the rod will continue to be moved by thespring-16. c

The pins 41 and the springs 42 may be so constructed as to slightly tiltthe upper con tact 40 so that when the circuit is broken there will be aslight shearing movement of the contacts relative to each other andbreak any welding that might occur by reason of the increased currentformed in the breaking of the circuit.`

tracted portion 31 of the cylinder 30 where- The construction selectedand described may be greatly varied 1n the arrangement and manufactureof its parts and in the sub- T,

stitution of elements having Aequivalent func- '4 tions andsuchmodifications may be used for many varied purposes and still containthe invention.

What I claim as,v new and desire to secureA in the housing, a spring foractuating the rod in one direction relative to the housing, a secondcontact secured to the rod, a releasable buffer secured to the rod and asecond spring for returning the housing, contacts and therod to theirnormal positions.

2. The combination of a pair of contacts, a member for closing thecontacts, one of the contacts secured to the member, la yielding memberconnecting the first member to the other contact and meansfor regulatingthe time interval in which the contacts are closed. tion of the spring`16. The contact 43 will 3. The combination of a pair of contacts, a'closing member for closing the contacts, a spring connecting the closingmember with one of the contacts,v closing operation of the closingmember for permitting the said spring to open the'contacts. Y

4. The combination of a pair of contacts, a closing member for closingthe contacts, a spring connected between the contacts for separating thecontacts and a detent for temporarily holding the contacts in closedrelation. the valve disk'21 is closed, contact is made 5. Thecombination of' a pair of contacts, a closing member for closing thecontacts, a spring locatedintermediate the contacts for opening thecontacts' and a sprin for returning the contacts to their normapositions and a detent for permitting the contacts vto be temporarilyretained in their closed positions.

6. The combination of a air of'contacts, a closing member, a springocated intermediate the contacts, one of the contacts connected to theclosing member, the other contact connected to the spring and a bufferconnected to one of the contacts for holding the contacts closed.against the opening operation of the spring.

7. The combination of a pair of contacts, a member for closing thecontacts, one of the contacts connected to the member, a yielding meanslocated intermediate the contacts, a buifer connected to the other ofthe contacts for holding the contacts closed against the operation. ofthe yielding means, a second yielding means for returning he contacts totheir normal positions.

8. The-combination of a pair of contacts, a member for closing thecontacts, one o the contacts connected to the member, a

a detent released in the i 31,152,433 yielding means iocefeol`inermeiate the oonaots, a buer connected to the other of the signed myname to this specication in the contacts foi' holding the contactsclosed presence of two subscribing Witnesses.

against the operation of the yielding means, THUMAS J. MURPHY. ayielding means for returning the buier, Witnesses:

`the dosing member and the contacts to igheir ROBERT B. COCHRAN, normalpositions. EDWARD MILLER.

n testimony whereof, I' ha-Ve hereunto

